Mopsus (Ancient Greek: Μόψος) was a Seer who lived in ancient Greece. He defeated fellow Seer Calchas in a competition of their powers.

There was a portrait of Mopsus hung in the Dungeons of Hogwarts Castle. It hid a secret chamber, and the password was "Forsooth".

Behind the scenes

Mopsus was a Greek seer and diviner in the court of Amphilochus. He correctly predicted that an upcoming battle would end in great defeat, to the contrary of rival seer Calchas's prediction that it would end in great victory. He later died in a quarrel with Amphilochus over the right to the throne. [1]